class Point:
    '''
    构造方法，构造器constructor
    '''
    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y

    def __str__(self):
        return '（%d,%d)' % (self.x, self.y)

    @classmethod
    def class_method(cls):
        pass
    @staticmethod
    def static_method():
        pass



